Fluid apportioning and dispensing device



March 24, 193

A. R. THOMPSON 2,034,964

FLUID APPORTIONING AND DISPENSING DEVICE Filed Oct. 12, 1953 5Sheets-Sheet 1 ATTOR EY March 24, 1936. AQR. THOMPSON 2,034,964

FLUID APPORTIONING'AND DISPENSING DEVICE Filed ootplz, 1935 5Sheets-Sheet 2 OINVENTOR. fl/berfi If Zia/79am.

1.936; A. R. THOMPSON Q 2,034,964

' FLUID Arronnonme AND msrsnsme Davies 1 Fil ed Oct. 12, 1955 5 Sheets-Sheet 4 2.0. dd.

A. R. THOMPSON' FLUID APPORTIONING AND DISPENSING DEVICE Mara. 24, 1936.

Filed Oct. 12, 1933 5 Sheets-Sheet 5 INVENTOR. l/ert/ifffiam waq.

1 Arm Patented Mar. 24,1936

2,034,964 .FLUID mon'nomc AND DISPENSING DEVI Albert R. Thompson, SanJose, cans, asdgnor to Food Machinery Corporation, San Jose, CaliL, acorporation of Delaware Application October 12, 1933, Serial No. 693,360

Commercial canned fruit of the better grades is packed in syrupconsisting of sugar and water, several grades of syrup being usedaccording to the quality of .the product being packe'dthe grades(referred to in canning parlance as degrees) of syrup differing in sugarcontent.

Inasmuch as the syruping operation (putting syrup into the cans) isperformed on the same 1 machines regardless of the grade of fruit beingpacked, and inasmuch as the pack is apt to vary from day to day or evenfrom hour to hour, it is necessary to be able to shift quickly'from onegrade (degree) of syrup to another. Heretofore this has'beenaccomplished through the provision of several syrup supply tanks(located usually on the floor above the syruping machines) and anet-work of pipes interconnecting the syrup supply'tanks with thesyruping machines. I

Such an arrangement, in addition to entailing a costly installation, isdeficient in that it fails to take into account differences in sugarcontent of the fruit. For a given quality of product it is oftenpracticable to .use syrup or a lesser sugar content if the fruit isquite ripe than in the case-of under-ripe fruit; and although thedifferences in the percentage of sugar necessary in the syrup may besmall it is, nevertheless, possible to efiect very substantial aggregatesavings on, say, a season's pack, amounting to many thousands of casesof fruit and involving hundreds of tons of sugar. With the ,old syrupsupply systemto which reference has been made, it

was not practicable to'eflect small variations A further deficiency inthe old system of syrup supply and distribution resides in the fact thatit is necessary to mix and maintain supplies of syrup of some five orsix difierent degrees, and it has usually required the entire time ofone competent man throughout the packing season 5 to: maintain the syrupsupplies in the several supply tanks. I

' Still another defect in the old system is that it lends itself veryreadily to-the mistake of turning on syrup 0! the wrong degree at thesyruping 55 machines. While this is not apt to happen if the r which isregarded as being'best adapted to the dispensing of syrup and water.

14 Claims. (organ-9e) machine operator is on, the alert, nevertheless itdoes happen only too frequently in actual practice.

The primary object of the present invention is to provide a more simpleand less expensive arrangement for supplying syrup to the syrupingmachines and, at the same time, one which will facilitate the making ofsmall variations in the sugar content of the syrup to compensate forvariations in the sugar content of the fruit. This 10 has beenaccomplished by substituting for the several syrup supply tanks of theprior practice a single supply tank containing syrup of the maximumsugar content ever required and providing a novel device (usually onefor each syrupl5 ing machine) which will be referred to hereinafter asan apportioning and disp nsing devicethe function of which is to receivesyrup from the supply tank and dispense it to the syruping machine ormachines, as'the case may be, together with whatever proportion of watermay be needed to reduce the syrup to the prescribed depable ofdelivering syrup and water in the required proportions to the syrupingmachines and capable of 'quick readjustment by the operator to changefrom time to time the proportions of the syrup and water.

A novel apportioning and dispensing device as purpose is illustrated inthe accompanying drawings and will be described in detail hereinafter;but it will be apparentto those skilled in the art, and will be madefurther evident as the detailed description progresses, that there arenumerous alternatives and modifications within the scope and purview ofthe broad inventive concept.

- ,Neither the device to be described nor the nuv merous alternativedevices and modifications embraced within the scope of this inventionare limited in their utility to the apportioning and They are equallyuseful, as will be evident, wherever there is occasion to apportion anddispense two or more fluid constituents, which in their nature aresusceptible of being character.

Referring to the drawings Figure 1 is a'front elevation of a cansyruping machine illustrating the. application thereto handled by adevice of this respectto the matter of supplying the corof theapportioning and dispensing device in acof which are defined .by thesurfaces 4e. Each cordance with the present invention.

Fig. '2 is'a plan view of the apportioning, and

Fig. 3 is a front elevational view of the apportioning and dispensingdevice, partially in cross a dispensing device.

section-e-the sectional portion being taken along ports in the cylinderblocks and piston sleeves,

,v vmi the device adjustedto deliver equal quanti- "ties of water andsyrup to the syruping machines.

Fig. 7 is a development diagram similar in every respect to that of Fig.6, except that it illustrates the various relative positions of thevalve ports with the device adjusted to deliver either water alone orsyrup alone to the syruping machines, depending upon which of the twocylinders of the device is considered to be handling syrup. For purposesof description it will be assumed that with thevalves adjusted as shownin Fig. '7 the device is delivering undiluted syrup alone, and no water.

Fig. 8 is a development diagram like those of Figs.'6 and 7, but withthe valves adjusted to the extreme opposite position as compared withthe valve setting of Fig. '7. A

The device comprises a base plate I on which are mounted two opposedcylinder blocks 2 and 3 respectively, a double ended plunger 4 theopposite ends of which are disposed in the bores of cylinder blocks 2and 3, respectively, an electric motor 5 having an integral speedreduction gear head 6, a spherical eccentric I mounted on the driveshaft of the motor, a bifurcated pitman '8 interconnecting the plunger 4with the spherical eccentric I, a slidable carriage 9 upon which themotor 5 is mounted, an adjusting screw III with a hand wheel I I, anindicator II, a calibrated scale l3, intake pipes l4 and I1, dischargepipes I5 and I6, and cover plates l8, l9, and 2|.

- For purposes of description the intake pipe I 4 connecting withcylinder block 2 will.be assumed to be connected to a syrup supply tankfrom which syrup flows by gravity through pipe l4 to the apportioningand dispensing device. It will further be assumed that the intake pipeI! to cylinder block 3 is connected to a source of water supply undersuitable pressure, andthat the discharge pipes l5 and I6 are connectedto the tank gether with sectional views 4 and 5. The cylinder blocks arecast with intake chambers in, la,

to which the intake pipes are connected, and

which are in communication with the interior through .the rectangularintake ports 2b, 3b. Similarly, each cylinder block is cast with a disa.charge chamber 20, ac to which the discharge end of the plunger iscored cylindrically, as a con-v ,sequence of which the extreme endportionsof the plunger beyond the surfaces 4e form, respectively,annular skirts or sleeves 4}. The plungers are, of course, groundcylindrically to a close running fit in the bores of the cylinderblocks. In each of the sleeves 4! there are two rectangular intake ports4b and rectangular discharge ports 4d. The intake and discharge portsare shown in all figures of the drawings but are illustrated to bestadvantage in the valve develports it is necessary to provide meansoperable not only to reciprocate the plunger 4 longitudinally, butalsoarcuately about its longitudinal axis.

The means here provided for reciprocating the plunger'bothlongitudinally and arcuately comprises the driving motor 5, thespherical eccentric l which is driven by the motor 5 through thereduction gear 6, and the bifurcated pitman 8 which is bored sphericallyat oneend to engage the spherical eccentric 'l and which is pivotallyconnected to the plunger 4 by means of a pin 22. The motion transmittedto the cylindrical surface of plunger 4 may be compared with themovement of a point traversing an elliptical path projected upon acylindrical surface. Such a path projected in turn upon a flat surfaceis illustrated in each of the development diagrams of Figs. 6, 7 and 8and designated by reference dispensing fluids in an invariable fixedproportion, the motor 5 could be attached stationarily I to the baseplate, but inasmuch as one of the functions of the device, when used asan auxiliary to a syruping machine, isto enable quick changes in theproportions of syrup and water, it is necessary to make some provisionfor effecting such adjustments and this has been accomplished bymounting the motor on carriage 9 which, in turn, is mounted slideably onthe base plate I,the directions of movement of the carriage 9 beingindicated by the double headed arrow, Fig. 2. The adjustment is in aplane parallel to the direction of longitudinal reciprocation of theplunger. The carriage 9, while slideably secured to the base plate, isadjustably movable by means of the adjustingscrew Hi to which isattached and plunger, are moved in a direction depending upon thedirection of rotation of the hand wheel. The manner in which theseadjustments bring about variations in the apportionment of fluidsdispensed will be explained presently, in connection with thedevelopment diagrams of Figs. 6, '7 and 8. Suiilce it to say for themoment, that the hand wheel ll, upon operation of which the entire motorassembly, together with the pitman the operator of the syruping machineadjusts the device to deliver syrup and water in the proper proportionsby rotating'the hand wheel II in one, direction or the other until thepointed end of the indicator I2 is brought. into registration with theproper graduation on the calibrated scale II, the scale readings ofwhich indicate directly the resulting degree of syrup. It is to beunderstood that degree is the term used indicator I2 is pivoted at'aflxed point 24 and is connected'through a link 25 to the motor carriage9, and,.as will be evident, the point of the indicator moves backwardand forward. over the scale in conformity with themovements of the motorassembly. I

In each of the development diagrams, Figs. 6, 'I and 8, the intake anddischarge ports in the cylinder blocks are shown in full lines, whilethe complementary intake and discharge ports in the sleeves U are shownin dot and dash lines. In each of the three diagrams the moving ports,which is to say the ports in the sleeves ii, are shown in four of thepositions which they occupy during a complete cycle of the plunger. Itwill be remembered that the moving ports traverse,

as previously stated, an eliptical path projected on a cylindricalsurface,'which path .corresponds to that designated by reference numeral23 oneach of the developmentdiagrams. While the moving ports areillustrated each in four cyclical positions, a

positions and movements of the ports at which may be termed themid-position adjustment,

by which is meant the position of the motor as-. sembly wherein theopposite ends of the plunger project equally into the cylinders atmid-stroke. In this position the discharges from the two cylinders'areequal, which is to say that equal quantities of syrup and water aredelivered to the syruping machine by the apportioning and dispensingdevice. The direction of travel of the moving ports is indicated by onthe diagrams.

- With respect to cylinder block 2, it is apparent that the intakeoccurs when the plunger is moving to the right, and from Fig.6 it .willbe evident that the intake ports are in registration only during aportion of the intake stroke and are not in registration at all duringany part of the discharge stroke. 'The discharge ports come intoregistration during the latter part of the intake stroke, but only afterthe intake ports have closed and the cylinder is' completely fllled. Thedischarge ports remain in registration during the entire dischargestroke, but close before the opening of the intake ports. Obviously,there can be no flow-back to the cylinder through the discharge portssince at no time while the discharge ports are in registration is thereany unoccupied space in the cylinder into-which fluid could flow.

In the mid-position setting according to Fig. 6

the cycle of operations'of the valves in the right hand cylinder areexactly the same win the left hand cylinder, except that they are 180degrees out\of phase,the intake stroke occurring in one ylinder duringthe discharge stroke in the othe and vice versa.

Fig. '7 illustrates the valve action in the two cylinders when the motorassembly is adjusted to Having assumed that cylinder 2 is connected to.the syrup supply tank and cylinder 3 to a v source of water supply, thevalve adjustment of I suction stroke.

appropriate arrows termine the elliptical Fig. 7 will result indelivering syrup but no water, because the intake ports and dischargeports at the left both come into registration during each cycle but theintake ports at the right do not come into registration at all duringthe cycle,

although the discharge ports do come into registration. That being thecase, no water enters cylinder 3 and, of course, none can be discharged;and it follows that syrup of maximum sugar content will be delivered tothe syru'ping machine.

In Fig. 8 the extreme opposite adjustment of the valves is illustrated,and in this case water alone is delivered to the syruping machine, sincethe intake ports at the left do not come into registration during anypart of the cycle.

There are, of. course, an infinite number of possible intermediate valvesettings between the extremes illustrated by Fig. 'Z'and 8, of whichFig. 6 is but one, and for every such setting a different ratio of syrupto water is dispensed. In all of the other intermediate settings,thatis, settings lying between thoseof Figs. 6 and 7 and settings lyingbetween those of Figs. 6 and 8, the valve port layout is s gh that bothintake and discharge ports are open during the suction stroke-but not atthe same time. In those settings syrup or water, as the case may be, isdrawn into the cylinder partly from the intake pipe and partly from thedischarge pipe. Hence the quan-- tity of fluid delivered by eachcylinder per cycle is equal to the displacement volume per cylinder lessthe amount drawn back into the cylinder from the discharge pipe .duringthe suction stroke, which, manifestly is the quantity flowing into thecylinder'from the intake pipe during the Another wayof describing thisaction is to compare it with that 01.8 force pump having two intakevalves which open consecutively during each intake stroke of the piston,but which are never open at the same time during an intake stroke.Obviously the quantitative ratio of fluids taken into the cylinderthrough the respective intake valves per cycle of'operation would dependupon the relative piston displacements during the open periods. That isprecisely v what occurs in the present case, but the operation may be alittle obscured by the fact that one of the intake valves functions alsoas a discharge valve.

' 1 It so happens that two identical intake ports have been provided inthis particular case but this is mere duplication, resulting from thefact that the desired area was better obtainable with two duplicateintake ports than with one of twice the area. This is due in the instantcase to the shortness of the stroke.

No rule or formula for determining the valve layout, applicable to allcases where the bore and stroke is known, has been developed. Indesigning the apportioning and dispensing device herein described thepositions of the valve parts and their movementswere determined by trialI and error, so to speak. The method of procedure connections can benoted. Within obvious limits the bore and stroke, as well as the angle.of arcuate reciprocation and the area, from and location of parts, areall factors amenable to variation and it is certain that any competentmachine designer can follow the foregoing method 0! procedure and arriveat a correct layout without exercising anything more than commonengineering intelligence.

So far as the application of the present device to syrup machine serviceis concerned there will probably never be any occasion to utilize eithermore or less than two cylinders per device, since there are only twoconstituent fluids, namely, syrup and water, to be dispensed; but itwill be apparent that the utility of this device is not limited tosyruping machine service, and that any number of cylinders could beemployed .conformably to the number of different fluids to beapportioned and dispensed. Of course that would require appropriatechanges in the design, but the underlying principles would still remain.Again it will be apparent that each cylinder dispenses a uniformquantity of fluid per cycle of operation, which quantity is readilyvariable by shifting the plunger path within the cylinder. A device ofthis character with but one cylinder would, obviously, have utility as afluid dispensing and necessary device.

While the particular design of apportioning dispensing deviceillustrated and described, having a-single plunger and opposed cylinderstogether with valves of the sliding sleeve type, is considered ideal,none of those features are inherently vital and indispensable. There aremany practicable alternative arrangements within the scope and purviewof the invention which it would serve no useful purpose to illustrate,but which are intended to be embraced within the terms of the appendedclaims.

- In applying the herein-described device or other apportioning anddispensing device within the scope of this invention to syruping machineservice or like situations wherein the locus of delivery of theconstituent fluids includes a tank, such as the tank of a syrupingmachine which, in the absence of preventive measures, may be overflowed,it is desirable to provide some automatic means for starting andstopping the device responsively to the level of the delivered fluid.This can be accomplished most advantageously by including. in the motorcircuit a switch, meterably float-operated, which will open its circuitwhen the delivered fluid has risen to'a predetermined level and closethe circuit when the level has receded to another'predeterminedelevation.

- Such an arrangement is illustrated in Figure 1 wherein the applicationof the dispensing device to a can syruping machine is shown. Thesyruping machine may be of conventional construction including the usualrotary tank or -reservoir I6 provided with valves 21 in its bottomthrough which the syrup is admitted to cans "therebeneath as the latterare pressed against the undersides of the valves by the travelling cancarriers 29. a

The dispensing device is illustrated as {having its intake pipes l4 andI! connected with separate sources of liquid supply ll and II, the former of which may be concentrated'syrup and the latter water. Thedischarge pipes II, and II are connected to a common delivery pipe I2which discharges into the tank II of the syruper. A float 30 is disposedwithin thetank 2C and has a lever arm 34 secured to the operating arm 35of I an electric switch 38 interposed in the supply wires 3! leading tothe motor 5 through flexible conduits 38, the arrangement being suchthat the rise of syrup in the tank 26 to a predetermined level actuatesthe float to open the switch 36, and.

In the subjoined claims there are a few instances of terminology notappearing hereinbefore in this specification and which for the sake ofgreater clarity it is thought desirable to apply to the disclosure atthis point. One of these'instances is the. use of the term crank member,which applies to the spherical eccentric I. This eccentric performs thefunction of a crank and the term crank member has been selected for usein some of the broader claims because it seems inherently better adaptedto signify generically the several mechanical equivalents of aneccentric or crank. The term "displacement member refers to the piston.It is not intended by the use of this term in certain claims to restrictthe rangeof equivalents of the term piston". The term cylinder chamberobviously refers to the cylindrical cavity in each of the cylinderblocks in which the pistons and sleeves are slidably disposed. It isthought to makefor greater clarity to define these chambers ascylinderswhich, obviously, is the most convenient geometric'al form-butit should be borne in mind that there is no inherent necessity thatthese chambers be geometrically-cylindrical and the term shouldtherefore be interpreted in its secondary sense.

What is claimed is:

1. A fluid dispensing device comprising a cylinder block having acylinder chamber and intake and discharge ports communicating with 'saidchamber, a piston arranged to reciprocate in said chamber, means forimparting to said piston a reciprocating motion consisting v of intakeand discharge strokes, a movable valve member operable to open and closesaid ports in timed rela- .tion to the reciprocating motion of saidpiston,

means for actuating said member in timed relation to the reciprocatingmotion of said piston, and means for adjusting said member with respectto said ports for enabling alteration at will within said chamber, meansfor imparting a reciprocatory motion to said piston, a valve memberoperable to open and close said ports in timed relation to thereciprocatory movements or said piston, means for actuating said valvemember, and 'means operable to alter at will the timed relation between.the movements of said piston and the opening and closing of said portswhereby-to vary the quantity of fluid discharged per cycle of operationof said piston Y 3. A fluid dispensing device comprising a cyl-' inderblock having a cylinder chamber together with-an intake port and adischarge portcommunicating with said-chamber, a piston disposed withinsaid chamber, means'for imparting-a reciprocating motion to said piston,a valve sleeve within said chamber operable to open and close said portsin timed relation to the reciprocatory movements of said piston, meansfor actuating said valve sleeve, and means operable to alter at will thetimed relation-between the movements of said piston and the opening andclosing of said ports whereby to vary the quantity of fluid dischargedper cycle of operation of said piston.

4. A fluid dispensing device comprising a cylinder block having acylinder chamber together with an intake port and a discharge portcommunicating with said chamber, a piston disposed within said chamber,means for reciprocating said piston cyclically, a slideable valve memberdisposed within said chamber, said valve member being connected to andmovable with said piston and operable to cover and uncover said intakeand discharge ports cyclically in proper sequence and in timed relationwith the reciprocating movement of said piston, and means operable toadjustably move said sleeve and thereby alter at will the timed relationbetween the movements of said piston and the opening and closing ofsaid. ports whereby to vary the quantity of fluid discharged per cycleof operation oi said piston.

5. A fluid apportioning and dispensing device comprising means defininga. pair of opposed cylinder chambers together with an intake port and adischarge port communicating with each of said cylinders, pistonsdisposed, one each, within said chambers, means mechanicallyinterconnecting said pistons, valve sleeves, each integral with one ofsaid pistons and disposed each within one of said chambers, and drivingmeans for reciprocating and arcuately rotating said pistons and sleevessimultaneously.

6 A fluid dispensing device comprising a cylinder block having acylinder chamber together with an intake port and a discharge portcommunicating with said chamber, a plunger member projecting into saidchamber and slideable therein with a reciprocatory motion, said plungermember functioning as a piston in said chamber, said plunger memberincluding as an integral part an end portion disposed within saidchamber forming an annular sleeve having an intake port opening and adischarge port opening, the last mentioned intake port opening anddischarge port opening being adapted to be moved into and out ofregistration with the intake and dis charge ports, respectively, in saidcylinder block in timed relation with the reciprocatory motion of saidplunger member, driving means for imparting both longitudinal and rotaryreciprocat ing motion to said plunger member including said sleeve, andadjusting means for moving said plunger member in the direction of itslongitudinal reciprocation so as to alter its mid-stroke position insaid chamber, the arrangement being such that said sleeve functions toopen and close the intake and discharge ports in proper sequence and,further, that the timing oi the openpitman pivotally connected to saidplunger member, a crank member laterally ofi-set from said plungermember, said pitman being connected with said crank and adapted totransmit motion from said'crank member to said plunger member, a motorfor driving said crank member, said motor together with said crankmember being siideably mounted relatively to said cylinder blocks and ina plane parallel to the directions of longitudinal reciprocation of saidplunger member, and means for adjustably moving said motor together withsaid crank member, the arrangement being such that the mid-strokeposition of said plunger member with respect to said chambers is alteredin response to positional adjustments of said motor and crank member.

8. A fluid apportioning and dispensing device comprising a pair ofopposed cylinder blocks each having cylinder chambers together withintake and discharge ports communicating with said chambers, a plungermember having its opposite ends projecting, respectively, into saidchambers and adapted to function as pistons therein, the extreme, andportions of said plunger member forming annular valve sleeves which aredisposed within said chambers, respectively, and adapted to open andclose said intake and discharge ports in timed relation with thereciprocatory motion of said plunger member, a pitman pivotallyconnected to said plunger member, a spherical eccentric in a positionlaterally oii-set' from the pivotal connection of said pitman to saidplunger member, said pitman being drivingly connected with saideccentric and adapted to transmit motion from said eccentric to saidplunger member, the motion thus transmitted to said plunger member beingboth longitudinally and arcuately reciprocatory, a motor for drivingsaid eccentric, a carriage mounted slideably relatively to said cylinderblocks and in a plane parallel to the directions of longitudinalreciprocation of said plunger member, said motor together with saideccentric being mounted upon and movable with said carriage, and anadjusting screw for adjustably moving said carriage together with saidmotor and eccentric, the arrangement being such that the mid-strokeposition of said plunger member with respect to said chambers is alteredin response to positional adjustments of said carrlage.

9. In a liquid dispensing device, a pair of pumps connected withseparate sources of liquid supply, each of said pumps including acylinder and a piston, valve means associated with each of said pumpsfor controlling the discharge therefrom, means for actuating saidpistons and valve means, and means for simultaneously varying the timingof the valve means of both pumps to vary the ratio of discharge fromsaid pumps.

10. In a liquid dispensing device, a pair of pump cylinders each havingan intake port and a discharge port, said intake ports communicatingwith separate sources or liquid supply, a pair of pistons in saidcylinders, means for reciprocating said pistons, means controlling saidintake and discharge ports, and means for simultaneously andproportionately adjusting said control means to vary the ratio ofdischarge from said pumps.

11. In a liquid dispensing device, a pair of pump connected withseparate sources of liquid supply, each of said pumps including acylinder and a piston, valve means associated with each oi said pumpsfor controlling the discharge therefrom, means for actuating saidpistons and valve means in timed relation, and means for simultaneouslyand p oportionately adjusting the tim-' ing of the valve means of bothpumps and the position of the stroke 0! both pistons relative to theirrespective cylinders to vary the ratio of discharge from said pumps.

"12. In a liquid dispensing device, a pair of pumps connected withsupply, each 0! said pumps including a cylinder and a piston, saidcylinders being arranged in tandem, and the pistons being interconnectedfor simultaneous reciprocation, and means for varying the position 01'the stroke of said interconnected pistons to equally and reversely varythe operative relations 01! said pistons with respect to theirrespective cylinders.

13. In a liquid dispensing device, a pair of pump cylinders arranged intandem and respectively provided with intake and discharge ports, saidintake ports communicating with separate sources oi liquid supp y. apair or pistons in said cylinders interconnected i'or simultaneousactuation, means for reciprocating said pistons, slide valves carried bysaid pistons for actuation thereby to cover and uncover said intake anddischar e orts in timed ,pumps.

relation to the operation of said pistons, and means for simultaneouslyadjusting said pistons to alter the timing or said valves so as to varythe discharge of the pumps in reversely proportional relation.

14. In a liquid dispensing device, a pair 01 pump cylinders arranged intandem and respectively provided with intake and discharge ports, saidintake ports communicating with separate sources of liquid supply, apair of pistons in said cylinders interconnected for simultaneousactuation, drive means for imparting compound reciprocation and rotativeoscillation to said pistons, slide valves carried by said pistons foractuation thereby to cover and uncover said intake and discharge portsin timed relation to the operation oi. said pistons, and means forvarying the position of the stroke or said interconnected pistons withrespect to their respective cylinders to alter the timed relationbetween the piston movements and the opening and closing of said intakeand whereby to vary the ratio of ALBERT R. THOMPSON.

discharge ports, discharge from said &

CERTfFlCATE or consscmon.

Patent No. 2,034,964. v March 24, 1936.

ALBERT R. THOMPSON.

It is hereby certified that error appears in the printed specificationof a the above numbered patent requiring correction as follows: Page 3,first 2 column, line 25, for "consequently" readconsecutively; page 5,second column, line 70, claim 11, for "pump" read pumps; and that thesaid Letters Patent should be read with these corrections therein thatthe same may conform to the record of the case in the Patent Office.

Signed and sealed this 12th day May, A. D. 1936.

Leslie Frazer I (Seal) Acting Commissioner of Patents.

